retinoscope

retinoscope
An optical device used to illuminate a subject's retina during retinoscopy. [retino- + G. skopeo, to view]
- luminous r. a portable optical device providing either a circular or linear (streak) beam of light.
- reflecting r. a plane or concave mirror with a central perforation that allows the observer to see rays emerge from the subject's eye.

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ret·i·no·scope 'ret-ən-ə-.skōp n an apparatus used in retinoscopy

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n.
an instrument used to determine the power of spectacle lens required to correct errors of refraction of the eye. It is held in the hand and casts a beam of light into the subject's eye. The examiner looks along the beam and sees the reflection in the subject's pupil. By interpreting the way the reflection moves when he moves the instrument, and by altering this by lenses held in his other hand near the subject's eye, he is able to detect long- or short-sightedness or astigmatism and to determine its degree.

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ret·i·no·scope (retґĭ-no-skōp″) an instrument for performing retinoscopy; called also skiascope.

Medical dictionary. 2011.

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Look at other dictionaries:

  • retinoscope — [ret′ n ə skōp΄] n. [see RETINA & SCOPE] an instrument used in retinoscopy …   English World dictionary

  • retinoscope — /ret n euh skohp /, n. Ophthalm. an apparatus that determines the refractive power of the eye by observing the lights and shadows on the pupil when a mirror illumines the retina; skiascope. [RETIN(A) + O + SCOPE] * * * …   Universalium

  • retinoscope — noun an instrument used for examining the refraction of light within the eye Syn: skiascope …   Wiktionary

  • rétinoscope — (ré ti no sko p ) s. m. Terme de médecine. Synonyme d ophthalmoscope. ÉTYMOLOGIE    Rétine, et du grec, examiner …   Dictionnaire de la Langue Française d'Émile Littré

  • retinoscope — instrument for measuring and viewing the retina Scientific Instruments …   Phrontistery dictionary

  • retinoscope — n. instrument used to determine the refractive capacity of the eye by directing light at the retina (Ophthalmology) …   English contemporary dictionary

  • retinoscope — ret·i·no·scope …   English syllables

  • retinoscope — n. an instrument used to determine the power of spectacle lens required to correct errors of refraction of the eye. It is held in the hand and casts a beam of light into the subject s eye. The examiner looks along the beam and sees the reflection …   The new mediacal dictionary

  • retinoscope — ret•i•no•scope [[t]ˈrɛt n əˌskoʊp[/t]] n. oph an apparatus that determines the refractive power of the eye by observing the lights and shadows on the pupil when a mirror illumines the retina ret i•nos′co•py ˈɒs kə pi n …   From formal English to slang

  • retinoscope — /ˈrɛtənəskoʊp/ (say retuhnuhskohp) noun → skiascope …  

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